Email Ports – POP3, IMAP and SMTP Port Numbers (kekhosting.com)
Internet Message Access Protocol - Wikipedia
POP3 Port Numbers. Default POP Port number : 110. POP3 port number with SSL/TLS : 995.
An IMAP server typically listens on port number 143. IMAP over SSL/TLS ( IMAPS) is assigned the port number 993.
Ports 25, 465, 587, or 2525 for SMTP have all been considered standard SMTP ports at some point, but only 587 or 2525 really should be considered for modern use.
Port 25: The original standard SMTP port
Port 465: Deprecated and out-of-date SMTP port
Port 587: The standard secure SMTP port
Port 2525: A common alternate SMTP port
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